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• W2149934112 abstract "The proliferative activity and other characteristics of germ cells in the vitamin A-deficient (VAD) rat testis were investigated. In the VAD testis, A spermatogonia and preleptotene spermatocytes were found. The A spermatogonia in the VAD testis showed a bromodeoxyuridine (BrdU) labeling index of 6.6 ± 1.1% and a mitotic index of 2.8 ± 0.5%. After continuous labeling with BrdU for up to four days, the ultimate labeling index of A spermatogonia was 11.6 ± 2.5%, which is less than expected. It is concluded that in the VAD rat testis, many of the proliferating A spermatogonia degenerate. During the first 18 h after administration of vitamin A, no increase was observed in either the labeling index or the mitotic index of the A spermatogonia. However, after 24 h the first wave of A spermatogonia in S phase was found, and the first wave in mitosis was found after 48 h. Furthermore, in the VAD testis the DNA content of most of the A spermatogonia was similar to that of Sertoli cells, i.e., 2n. It is concluded that in the VAD situation, nearly all A spermatogonia are arrested before the S phase of the A1 spermatogonia. The hypothesis is put forward that in the VAD testis, the remaining A spermatogonia are the undifferentiated spermatogonia that are unable to differentiate into A, spermatogonia. The preleptotene spermatocytes in the VAD testis showed a BrdU labeling index of 20.3 ± 3.5%, while the DNA content of most of these cells was between 3n and 4n. It is concluded that most of the preleptotene spermatocytes in the VAD situation are arrested in the S phase, preventing them from entering the meiotic prophase. After vitamin A administration, the BrdU labeling index of spermatocytes increased significantly, but condensed chromosomal figures were formed in these cells and degeneration took place. Nevertheless, some of the preleptotene spermatocytes developed into spermatids." @default.
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• W2149934112 date "1995-09-01" @default.
• W2149934112 modified "2023-10-05" @default.
• W2149934112 title "Characteristics of a Spermatogonia and Preleptotene Spermatocytes in the Vitamin A-Deficient Rat Testis1" @default.
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• W2149934112 doi "https://doi.org/10.1095/biolreprod53.3.570" @default.
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